Light balance compensated mercury vapor and halogen high-pressur

Details Light balance compensated mercury vapor and halogen high-pressur Light balance compensated mercury vapor and halogen high-pressur

1991-04-22

1993-08-24

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

313640, 313641, H01J 1720, H01J 6120

Patent

active

052392325

ABSTRACT:
The high-pressure lamp has a fill including a metal halide of two groups, which the first group is a first rare earth halide of dysprosium, thulium and optionally holmium, and a second group of rare earth halide, namely cerium, neodymium, praseodymium, lanthanum; and an alkali metal halide, such as sodium halide and/or cesium halide, preferably iodide or bromide of sodium and/or cesium. The lamp has a high proportion of light radiation in the red range of the color spectrum to provide substantially improved color rendering indices, particularly in the Ra.sub.8 region, thereby providing better color balance, without loss of lifetime.

REFERENCES:
patent: 3798487 (1974-03-01), Zollweg et al.
patent: 3842307 (1974-10-01), Dobrusskin et al.
patent: 4171498 (1979-10-01), Fromm et al.
patent: 4658177 (1987-04-01), Gosslar et al.
patent: 4801846 (1989-01-01), Kramer et al.

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